The latest design of the five-story spheres that Amazon.com plans to build on its downtown Seattle campus looks like "Star Wars" meets "Jurassic Park."

Architects from the Seattle office of NBBJ submitted new drawings of the spheres and an adjacent 38-story office building planned for the block between Sixth and Seventh avenues and Lenora and Blanchard streets. In addition, the massing of the tower was changed because of the updated design for the spheres.

A city board is scheduled to review the design at 5:30 p.m. Tuesday at Seattle City Hall. In a packet of information submitted to the board, architects indicated they’ll have a large-scale model of one of the spheres to show what the interior will look like.

In a previous design packet, Amazon representatives said the spheres would be “visually reminiscent of a greenhouse or conservatory,” and would have “high bay spaces” capable of accommodating mature trees. This is still the plan.

NBBJ officials wrote in the most recent packet that the “generative idea is that a plant-rich setting has restorative qualities that are not found in the typical office.”

Architects added that they “further advanced” the design in response to input from Amazon and comments from design review board members.

They wrote that the goal of the spheres is to “create an alternative environment at the center of the three-block campus.” The spheres and adjacent open space will be both “a workplace environment and a visual focus for the entire project and surrounding neighborhood.”

There will be some retail space in the spheres, which are in the second phase of the campus. The first phase, which consists of a high-rise office building and auditorium, is under construction just to the south of where the spheres are planned for the north side of Lenora Street.

The first phase is scheduled to open in late 2015, Amazon Director of Global Real Estate and Facilities John Schoettler said. Phase II will open in 2016. The opening of the third phase at Eighth and Westlake avenues, where a Toyota dealership operates, will depend on the company’s head count but could happen in 2017, Schoettler said.

Thethree phases will have 3.3 million square feet of office, retail and meeting space.